Vol. 16 No. 2
Water productivity and economics of rabi sunflower as influenced by nitrogen and potassium fertigation schedules
Author(s): K. P. REDDY, M. U. DEVI, V. RAMULU AND M. MADHAVI
Abstract: The present study was conducted to identify the optimum nitrogen and potassium fertigation schedules for rabi sunflower (variety DRSH-1) under semi-arid climate of Hyderabad in 2017-18. The experiment was conducted in a randomized block design with nine treatments replicated thrice. The nine treatments were combinations of N (75 kg ha-1) and K (30 kg ha-1) fertilizers applied by fertigation through ventury at different intervals viz., 3 days and 4 days. Drip irrigation was scheduled once in 2 days at 0.8 E pan. Fertigation was imposed at 16 DAS to 88 DAS and completed in 19 and 10 splits in 4 and 8 days interval, respectively. The sources of N and K fertilizers were urea and potassium sulphate, respectively. The amount of total irrigation water applied was 3188 m3 and 4666 m3 in drip irrigation and furrow irrigation treatments, respectively. Application of 75 kg N and 30 kg K2O ha-1, at 4 days interval (T7) has recorded higher seed yield (2623 kg ha-1), water productivity (0.82 kg m-3) and was at par with (T8) 75 -30 kg N-P2O5 kg ha-1 applied at 8 days interval (0.76 kg m-3), Significantly lower water productivity (0.38 kg m-3) was noticed in furrow irrigation with conventional manual application of fertilisers (T9). The highest net returns (Rs. 66,103 ha-1) and benefit cost ratio (2.59) were recorded in N and K at 4 days interval (T7) followed by N and K at 8 days interval (T8) (2.44).
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